Suppose I have an .fd file with some special font like a light
variant of the main font or an ultrablack. I can define these in an
fd file
\DeclareFontShape{T1}{gwfoo}{s}{n} {<-> gwec-foodemibold}{}
\DeclareFontShape{T1}{gwbar}{l}{n} {<-> gwec-barlight}{}
\DeclareFontShape{T1}{gwopa}{u}{n} {<-> gwec-opaextrablack}{}
But how do I access these in LaTeX? There is no \textub{} command for
exttra black.
Or: How could I create a sty file where one could have (for a rich
family) a set of the light+demibold or the normal+extrablack as 'set'?
This is all doable in ConTeXt, but is it als doable in LaTeX?
G